I'm just learning about plumbing so this might be a silly question...
I was looking at the central heating pipework in our bungalow's attic and noticed what appears to be a manual valve linking the flow and return pipes - see photo below. The valve I'm talking about is the one on the left.
Does anyone know what the purpose of this valve might be?
I was looking at the central heating pipework in our bungalow's attic and noticed what appears to be a manual valve linking the flow and return pipes - see photo below. The valve I'm talking about is the one on the left.
Does anyone know what the purpose of this valve might be?